The stereo encoder circuit with discrete elements

2014-11-28 12:19

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In the figure IC1-4069, Y1 and Y2 form a oscillator with frequency in 76KHZ; then the frequency is isolated and shaped by Y3-Y6 to be sent into frequency-halving circuit composed of IC2 and dual JK flip-flop CD4027, then it will produce a symmetrical + /-38KHZ and 19KHZ square wave, in which the + /-38KHZ square wave is used for controlling the IC3 analog switch CD4066; the stereo audio signal is input to switch for switching modulation, then it is mixed with 19KHZ frequency signal and sent to FM modulator after being isolated by the transistor 9014. FM modulator circuit can refer to a variety of FM transmitter circuits at the site.